CLI Reference Guide

Using the RF Trends Window 401
Table 56 lists the information displayed in the top section of the RF
Trends window.
If the SNR, Associated Clients, or Receiver Threshold column is red, this
indicates that the threshold configured for this parameter has been
exceeded. (See “Changing Monitoring Settings” on page 489.)
Table 56 RF Trends Columns
Column Description
Radio MAP name and radio number.
SNR Signal-to-noise ratio of the last data packet received by the
radio.
Throughput Rate at which data is transmitted by the radio, in bits per
second.
Authorized Clients Number of authorized clients associated with the radio.
Client Failures Combined number of the following types of errors:
 802.1X failures
 association failures
 authentication failures
 authorization failures
802.11 Packet Errors Number of frames received by the MAP radio that had
physical layer errors on the active channel. These errors
can indicate interference from a non-802.11 device.
Non-802.11 PHY Errors Number of times the radio detected energy on the active
channel that either was not recognizable as an 802.11
frame, or was above the power level of background noise.
Re-transmits Number of retransmitted packets sent from the client to
the radio on the active channel. Retransmissions can
indicate that the client is not receiving ACKs from the MAP
radio.
Receiver Threshold Radio’s hearing sensitivity, in decibels (dB).
Noise Floor (dBm) Current level of ambient radio noise present in the
environment.
The noise floor can increase sharply when a microwave
oven is operating. Certain 2.4 gigahertz transmitters, such
as cordless phones and webcams, appear to generate
“noise”, even though they are transmitting data. The data
is not encoded in 802.11 format, so it is not recognized as
data, but is perceived as noise.